<?php
// Copy to /home/bitrix/www/bitrix/.settings_extra.php
// Cache -> memcached instance on :11211 with igbinary serializer.
// Sessions are switched in .settings.php 'session' section (host memcached-sessions-svc note below).

return array(
    'cache' => array(
        'value' => array(
            'type'      => 'memcached',
            'memcached' => array(
                'host' => '127.0.0.1',
                'port' => 11211,
            ),
            // igbinary shrinks cache ~50% and is faster; php8.4-igbinary installed.
            'serializer' => \Memcached::SERIALIZER_IGBINARY, // = 2
            // Under load only one process regenerates cache, others get stale copy:
            'use_lock' => true,       // requires Bitrix main >= 24.0.0
            'sid'      => $_SERVER["DOCUMENT_ROOT"] . "#01",
        ),
        'readonly' => false,
    ),
);

/* Sessions (put into .settings.php 'session' value section):
  'session' => array(
    'value' => array(
      'mode' => 'separated',
      'lifetime' => 14400,
      'handlers' => array(
        'kernel'  => 'encrypted_cookies',
        'general' => array(
          'type' => 'memcache',
          'host' => '127.0.0.1',
          'port' => 11212,
        ),
      ),
    ),
    'readonly' => true,
  ),
*/